linux-kernel - Re: [RFC v1] tree-wide: remove "select FW

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Message-ID: <1432580834.2195.6.camel@Odin.com>
Date:	Mon, 25 May 2015 19:07:14 +0000
From:	James Bottomley <jbottomley@...n.com>
To:	"josh@...htriplett.org" <josh@...htriplett.org>
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Subject: Re: [RFC v1] tree-wide: remove "select FW_LOADER" uses

On Mon, 2015-05-25 at 10:54 -0700, Josh Triplett wrote:
> On Mon, May 25, 2015 at 12:55:17PM +0200, Paul Bolle wrote:
> > On Fri, 2015-05-22 at 14:43 -0700, josh@...htriplett.org wrote:
> > > Ideally, someone should teach Kconfig to handle recursive dependencies,
> > 
> > I'm probably reading too much in this remark, but how should it handle
> > that other than returning an error because the configuration it's fed
> > makes it run in circles?
> 
> I don't mean cyclic dependencies (for which Kconfig should just report
> an error, ideally including the full list of symbols forming the cycle).
> 
> I mean that Kconfig should do recursive dependency resolution.  If B
> depends on A, and C depends on B, I should be able to turn on C
> directly and have B and A enabled.

That's really hard in practise you have to make any symbol that selects
something depend on the dependencies of the selected symbol.  You can't
do this without involving a SAT solver.  A guy promised to do this a
couple of years ago, but the patches never materialised.  However, they
may exist somewhere if someone wants to take a look at completing it.

James

> As an intermediate measure, it'd be *really* handy to be able to browse
> in the curses UI directly from a symbol to the symbols it depends on to
> quickly enable/disable them, rather than having to look at the list of
> dependencies of a symbol, search for that symbol, remember the path the
> search showed, and browse there manually.
> 
> - Josh Triplett